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C
C
C +-----------------------------------------------------------------+
C | |
C | Copyright (C) 1986 by UCAR |
C | University Corporation for Atmospheric Research |
C | All Rights Reserved |
C | |
C | NCARGRAPHICS Version 1.00 |
C | |
C +-----------------------------------------------------------------+
C
C
C ---------------------------------------------------------------------
C
SUBROUTINE AGDLCH (IDCS)
C
C This routine deletes character strings previously stored by the
C routine AGSTCH (which see). It has the following argument:
C
C -- IDCS is the identifying integer returned by AGSTCH when the string
C was stored.
C
C The following common blocks contain variables which are required for
C the character-storage-and-retrieval scheme of AUTOGRAPH.
C
COMMON /AGCHR1/ LNIC,INCH(2,50),LNCA,INCA
C
COMMON /AGCHR2/ CHRA(2000)
C
CHARACTER*1 CHRA
C
C Only if the identifier is between -LNIC and -1, inclusive, was the
C string ever stored, so that it needs to be deleted. If the string is
C the last one in CHRA, we can just set INCA to point to the position
C preceding it; otherwise, we zero out the string but don't bother to
C collapse CHRA, which will happen in AGSTCH when the space is needed
C again. In either case, the index entry in INCH is zeroed.
C
IF (IDCS.GE.(-LNIC).AND.IDCS.LE.(-1)) THEN
I=-IDCS
J=INCH(1,I)
IF (J.GT.0) THEN
K=J+INCH(2,I)-1
IF (K.EQ.INCA) THEN
INCA=J-1
ELSE
DO 101 L=J,K
CHRA(L)=CHAR(0)
101 CONTINUE
END IF
INCH(1,I)=0
END IF
END IF
C
C Done.
C
RETURN
C
END
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